Turkey Tenderloin for 50

Hi-I'm trying to pull together a menu for a 65th birthday party. I am doing a combination of lamb curry over top rice and meat pies as these are native dishes to the birthday guest. I also want to add some Turkey Tenderloin as another choice. Knowing not everyone will want all three meats and there are also side dishes, how much curry, meat pies and tenderloin should I plan to make and also how much rice?